Variable angle reverse humeral tray

Patent metadata

Field	Value
Publication number	US-9615930-B2
Application number	US-201414338473-A
Country	US
Kind code	B2
Filing date	Jul 23, 2014
Priority date	May 4, 2012
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

A partial reverse shoulder prosthesis includes a humeral stem and a variable angle tray including a plate including a through hole including at least two cutouts oriented horizontally across from one another, and a repositionable variable angle stem occupying at least a portion of an internal cavity defined by the through hole and including a first washer including threads at least partially defining a first opening, a post at least partially occupying the internal cavity, and a pin insertable into the first opening and having a threaded head sized to engage the threads of at least one of the first washer and the post; wherein the wall of the internal cavity is sized to retain the first washer and at least a portion of the post.

First claim

What is claimed is:

1. A partial reverse shoulder prosthesis comprising:
a humeral stem; and
a variable angle tray adapted to be coupled to the humeral stem, the variable angle tray comprising:
a plate including a through hole at least partially defined by a wall that at least partially defines an internal cavity, the through hole including at least two cutouts oriented horizontally across from one another; and
a variable angle stem occupying at least a portion of the internal cavity, the variable angle stem being selectively axially repostionable with respect to the plate to change the axial position of the variable angle stem with respect to the plate, the variable angle stem comprising:
a first washer including threads at least partially defining a first opening and being insertable into the internal cavity;
a post at least partially occupying the internal cavity, the post including a tapered crown and an appendage axially extending from the plate, where the appendage is sized to be received by the humeral stem via a friction fit; and
a pin including a threaded head and a longitudinal shaft extending from the threaded head, the pin being insertable into the first opening, where the threaded head is sized to engage the threads of at least one of the first washer and the post;

wherein the wall is sized to retain the first washer and at least a portion of the post within the through hole.

2. The partial reverse shoulder prosthesis of claim 1 , wherein the first washer is discontinuous.

3. The partial reverse shoulder prosthesis of claim 1 , wherein the at least two cutouts are both oriented on the same side of a horizontal diametric chord of the through hole.

4. The partial reverse shoulder prosthesis of claim 1 , wherein at least one of the first washer and the tapered crown includes a rounded circumferential surface adapted to contact the wall.

5. The partial reverse shoulder prosthesis of claim 4 , wherein the rounded circumferential surface is at least one of smooth and textured.

6. The partial reverse shoulder prosthesis of claim 1 , wherein at least one of the first washer and the tapered crown includes a sloped circumferential surface adapted to contact the wall.

7. The partial reverse shoulder prosthesis of claim 6 , wherein the sloped circumferential surface is at least one of smooth and textured.

8. A partial reverse shoulder prosthesis comprising:
a humeral stem; and
a variable angle tray adapted to be coupled to the humeral stem, the variable angle tray comprising:
a plate including a through hole at least partially defined by a wall that at least partially defines an internal cavity, the through hole including at least two cutouts oriented horizontally across from one another; and
a variable angle stem occupying at least a portion of the internal cavity, the variable angle stem being selectively axially repostionable with respect to the plate to change an axial position of the variable angle stem with respect to the plate, the variable angle stem comprising:
a first washer including threads at least partially defining a first opening and being insertable into the internal cavity;
a second washer defining a second opening and being insertable into the through hole, the second washer including a widthwise dimension substantially greater than a thickness of the second washer;
a post at least partially occupying the internal cavity, the post including threads, a tapered crown and an appendage axially extending from the plate, where the appendage is sized to be received by the humeral stem via a friction fit; and
a pin including a threaded head and a longitudinal shaft extending from the threaded head, the pin being insertable into the first opening, where the threaded head is sized to engage the threads of at least one of the first washer and the post;

wherein the wall is sized to retain the first washer and at least a portion of the post within the through hole.

9. The partial reverse shoulder prosthesis of claim 8 , wherein the at least two cutouts are both oriented on the same side of a horizontal diametric chord of the through hole.

10. The partial reverse shoulder prosthesis of claim 8 , wherein the second washer is a spring washer.

11. The partial reverse shoulder prosthesis of claim 8 , wherein the second washer comprises a Belleville washer.

12. A partial reverse shoulder prosthesis, comprising:
a humeral stem; and
a variable angle tray adapted to be coupled to the humeral stem, the variable angle tray comprising:
a plate including a through hole at least partially defined by a wall that at least partially defines an internal cavity, the through hole including at least two cutouts oriented horizontally across from one another; and
a variable angle stem occupying at least a portion of the internal cavity, the variable angle stem being selectively axially repostionable with respect to the plate to change an axial position of the variable angle stem with respect to the plate, the variable angle stem comprising:
a first washer including threads at least partially defining a first opening and being insertable into the internal cavity;
a post at least partially occupying the internal cavity, the post including threads, a tapered crown and an appendage axially extending from the plate, where the appendage is sized to be received by the humeral stem via a friction fit; and
a pin including a threaded head and a longitudinal shaft extending from the threaded head, the pin being insertable into the first opening, where the threaded head is sized to engage the threads of at least one of the first washer and the post;

wherein the wall is sized to retain the first washer and at least a portion of the post within the through hole; and
wherein the post includes a hollow adapted to receive at least a portion of the longitudinal shaft of the pin.

13. The partial reverse shoulder prosthesis of claim 12 , wherein the at least two cutouts are both oriented on the same side of a horizontal diametric chord of the through hole.

14. The partial reverse should prosthesis of claim 12 , further comprising a humeral cup mounted to the variable angle tray.

15. A partial reverse shoulder prosthesis comprising:
a humeral stem;
a humeral cup; and
a variable angle tray adapted to be coupled to the humeral stem and the humeral cup, the variable angle tray comprising:
a plate including an arcuate wall at least partially defining an internal cavity, the through hole including at least two cutouts oriented horizontally across from one another;
a bearing adapted to occupy at least a portion of the internal cavity, the bearing being axially and rotationally repositionable with respect to the plate, the bearing operative to selectively expand in at least one dimension to wedge the bearing against the arcuate wall to inhibit axial and rotational repositioning of the bearing with respect to the plate; and
a projection adapted to be coupled to the humeral stem in order to mount the variable angle tray to the humeral stem;

wherein the arcuate wall is sized to retain a portion of the bearing within the internal cavity; and
wherein the bearing comprises a plurality of washers and a threaded fastener.

16. The partial reverse shoulder prosthesis of claim 15 , wherein the at least two cutouts are both oriented on the same side of a horizontal diametric chord of the through hole.

17. The partial reverse shoulder prosthesis of claim 15 , wherein:
the plate includes a through opening that communicates with the internal cavity; and
the internal cavity is partially

Assignees

• Biomet Mfg Llc

Inventors

• Katrana Nicholas

Classifications

• A61F2/4014 Primary

  Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts · CPC title

• A61F2002/30772

  Apertures or holes, e.g. of circular cross section · CPC title

• A61F2002/4018

  Heads or epiphyseal parts of humerus · CPC title

• A61F2002/30112

  Rounded shapes, e.g. with rounded corners · CPC title

• A61F2002/30604

  modular · CPC title